Demonstrations turn violent in Athens - as protesters throw rocks and molotov cocktails at police outside of parliament.br The presidential guard post outside the building caught fire - and a protester was set a blaze from the explosions.br A group of young rioters tried to enter parliament -- reaching the front steps for the first time since the Greek crisis began - where police retaliated with tear gas.br Several injuries have been reported - mainly minor burns and head wounds.br The clashes come as tens of thousands took to the streets in the Greek capital - to protest new austerity measures.br The 2-day strike has shut down government departments, businesses and public services.br Sarah Irwin, Reuters.